Our experience:
The Fanvil W610W and W611W Wi-Fi phones are really good at first glance.
Some customers were a bit bothered by the appearance, but we don't have a problem with that. Our problem is that the outer edges of the phones' plastic are very sharp (this will probably wear out eventually, or we'll use a Dremel for that). The W611W's display is worse in the light than the W610W's, and the main problem is the really annoying microphone noise when holding the device in your hand. The microphone isn't well isolated from the casing, and thanks to the surface and the outer edges, the person on the other end can always hear a scraping noise as long as you hold the phone in your hand and move even the slightest bit.
Unfortunately, the batteries also wear out quickly. After a few months of use, they only last a few hours a day. Replacing them is problematic because the batteries are unavailable.
But the W61xW has one huge advantage over the Yealink: they have BLF keys. That makes up for a lot of things. DECT phones don't have that either.
